Make owoify use last message's content if empty

src/main.rs

@@ -306,7 +306,7 @@ fn bottom_rng(ctx: &mut Context, message: &Message, mut args: Args) -> CommandRe
         .channel_id
         .messages(&ctx.http, |get| get.before(message.id).limit(num));
     if let Err(e) = messages {
-        let _ = message.channel_id.say(&ctx.http, format!("Error: {}", e));
+        return Err(CommandError(s!(format!("Error: {}", e))));
     } else {
         let mut messages = messages?;
         // remove all messages by other users
@@ -471,7 +471,22 @@ fn pfp(ctx: &mut Context, message: &Message) -> CommandResult {
 fn owo(ctx: &mut Context, message: &Message, args: Args) -> CommandResult {
     use owoify::OwOifiable;
 
-    let input: String = args.rest().trim().to_string();
+    let lastmsg = match message
+                               .channel_id
+                               .messages(&ctx.http, |get| get.before(message.id)
+                               .limit(1)) {
+        Ok(v) => v,
+        Err(_) => return Err(CommandError(s!("Could not get last message!")))
+    };
+
+    let ref lastmsg = lastmsg[0].content;
+
+    let input: String = match args.is_empty() {
+        true => {
+            s!(lastmsg)
+        },
+        false => args.rest().trim().to_string()
+    };
     let _ = message.channel_id.say(&ctx.http, input.owoify());
 
     Ok(())